Misfires can be caused by the Injector Loom being contaminated with oil. If you take the ECU out, look at IIRC the red plug and if it's got oil leaking through to the ECU there, then that may well be your problem. It's about £35 for the new Injector Loom, and you should be able to clean the other loom through with repeated cleaning.
Fuel is a major issue with these trucks must be premium and use 5 w 30 oil put seafome on the fuel it will clean system you can also get seafome spray pull a vacume line from intake with car running spray into intake this will clean the intake from any build up
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